Websockets and Webpack

[aphex]

Currently when you update code it is not reflected in the websocket handler. This is because handler method for websockets are created at startup during action creation. We need to swap this over to invocation time so that the handler is pulled in fresh.

This small fix moves that logic into invocation, like APIGateway calls. And makes it much faster to build websocket apps.

PR for fix is here #763

[dnalborczyk]

hey @aphex

thank you for bringing this up and for creating the PR! I gave some answers in your PR: #763